Bike or Design v1.3 is now officially released

The application itself was not changed, but i added some documentation about new features, especially portals (included in the package or you can read it online here).

UPDATE: the new version 1.3b fixes a bug in loading old levelpacks: depending on the circumstances it could change the regular checkpoint and obstacles into "dynamic" ones (in other words, the additional numeric attribute in these objects was not always zero).

I like that picture. The documentation is good; I wasn't sure about the "Mirror" portal option until I read it, and I see the Phantom ground is more useful than just confusing players. This also explains why the physics seemed to have small bugs, which are explained in the docs.